/**
 * DropZone - File Sharing Application
 * Dark Theme with Glassmorphism Design
 * Fully Responsive for Desktop & Mobile
 */

/* ============================================
   CSS VARIABLES & ROOT STYLES
   ============================================ */
:root {
    /* Colors - Dark Theme */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --bg-glass: rgba(26, 26, 37, 0.7);
    --bg-glass-light: rgba(40, 40, 55, 0.5);
    
    /* Accent Colors */
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --accent-glow: rgba(99, 102, 241, 0.4);
    
    /* Neon Accents */
    --neon-cyan: #22d3ee;
    --neon-pink: #ec4899;
    --neon-green: #22c55e;
    --neon-red: #ef4444;
    --neon-orange: #f97316;
    
    /* Text Colors */
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    /* Border & Surface */
    --border-color: rgba(148, 163, 184, 0.1);
    --border-glow: rgba(99, 102, 241, 0.3);
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.2);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    
    /* Z-Index Scale */
    --z-base: 1;
    --z-dropdown: 100;
    --z-modal: 1000;
    --z-toast: 1100;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   PARTICLE CANVAS BACKGROUND
   ============================================ */
#particleCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* ============================================
   APP CONTAINER
   ============================================ */
.app-container {
    position: relative;
    z-index: var(--z-base);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* ============================================
   HEADER STYLES
   ============================================ */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    font-size: var(--font-size-2xl);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: logoGlow 2s ease-in-out infinite alternate;
}

@keyframes logoGlow {
    from { filter: drop-shadow(0 0 5px var(--accent-glow)); }
    to { filter: drop-shadow(0 0 15px var(--accent-glow)); }
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav {
    display: flex;
    gap: var(--spacing-sm);
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.nav-btn:hover {
    background: var(--bg-glass-light);
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.nav-btn.active {
    background: var(--accent-gradient);
    border-color: transparent;
    color: white;
    box-shadow: var(--shadow-glow);
}

.nav-icon {
    font-size: var(--font-size-md);
}

/* Header Actions (User + Logout) */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.user-icon {
    font-size: var(--font-size-md);
}

.user-name {
    max-width: 100px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.logout-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.logout-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--neon-red);
    color: var(--neon-red);
}

.logout-label {
    display: inline;
}

/* ============================================
   MAIN CONTENT LAYOUT
   ============================================ */
.main-content {
    flex: 1;
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: var(--spacing-lg);
}

/* Full-panel views (Simple, Todos, Settings) - span full width */
/* Using :has() for modern browsers */
.main-content:has(.full-panel:not(.hidden)) {
    grid-template-columns: 1fr;
}

.main-content:has(.full-panel:not(.hidden)) .upload-panel {
    display: none;
}

/* JS fallback for browsers without :has() support */
.main-content.full-panel-active {
    grid-template-columns: 1fr !important;
}

.main-content.full-panel-active .upload-panel {
    display: none !important;
}

.full-panel {
    grid-column: 1 / -1;
    width: 100%;
    max-width: 100%;
}

/* ============================================
   UPLOAD PANEL
   ============================================ */
.upload-panel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.upload-zone {
    position: relative;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    overflow: hidden;
}

.upload-zone::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.upload-zone:hover,
.upload-zone.drag-over {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
}

.upload-zone:hover::before,
.upload-zone.drag-over::before {
    opacity: 0.05;
}

.upload-zone.drag-over {
    transform: scale(1.02);
}

.upload-zone-content {
    position: relative;
    z-index: 1;
}

.upload-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    color: var(--accent-primary);
    transition: transform var(--transition-normal);
}

.upload-zone:hover .upload-icon,
.upload-zone.drag-over .upload-icon {
    transform: translateY(-5px);
}

.upload-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.upload-subtitle {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
}

.upload-hint {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    display: inline-block;
}

/* ============================================
   RETENTION SELECTOR
   ============================================ */
.retention-selector {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.retention-label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.retention-options {
    display: flex;
    gap: var(--spacing-sm);
}

.retention-option {
    flex: 1;
}

.retention-option input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.retention-btn {
    display: block;
    padding: var(--spacing-sm);
    text-align: center;
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.retention-btn:hover {
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.retention-option input:checked + .retention-btn {
    background: var(--accent-gradient);
    border-color: transparent;
    color: white;
    box-shadow: var(--shadow-glow);
}

/* ============================================
   UPLOAD PROGRESS
   ============================================ */
.upload-progress-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.upload-progress-item {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.progress-filename {
    font-size: var(--font-size-sm);
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 70%;
}

.progress-status {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

.progress-status.error {
    color: var(--neon-red);
}

.progress-status.success {
    color: var(--neon-green);
}

.progress-bar-container {
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: var(--radius-full);
    transition: width 0.2s ease;
    position: relative;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.3) 50%,
        transparent 100%
    );
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    from { transform: translateX(-100%); }
    to { transform: translateX(100%); }
}

.progress-bar.error {
    background: var(--neon-red);
}

.progress-bar.success {
    background: var(--neon-green);
}

.progress-bar.success::after,
.progress-bar.error::after {
    animation: none;
}

/* ============================================
   DISK SPACE INDICATOR
   ============================================ */
.disk-space-container {
    margin-top: var(--spacing-md);
}

.disk-space-info {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    transition: all var(--transition-normal);
}

.disk-space-info.low {
    border-color: var(--neon-orange);
    background: rgba(249, 115, 22, 0.1);
}

.disk-space-info.critical {
    border-color: var(--neon-red);
    background: rgba(239, 68, 68, 0.1);
    animation: pulse-warning 2s ease-in-out infinite;
}

@keyframes pulse-warning {
    0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
    50% { box-shadow: 0 0 15px 2px rgba(239, 68, 68, 0.3); }
}

.disk-space-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.disk-space-label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
}

.disk-space-info.low .disk-space-label,
.disk-space-info.critical .disk-space-label {
    color: var(--text-primary);
}

.disk-space-value {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    font-family: 'SF Mono', 'Menlo', monospace;
}

.disk-space-bar-container {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.disk-space-bar {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: var(--radius-full);
    transition: width 0.5s ease;
}

.disk-space-bar.low {
    background: linear-gradient(135deg, var(--neon-orange) 0%, #fbbf24 100%);
}

.disk-space-bar.critical {
    background: linear-gradient(135deg, var(--neon-red) 0%, #f87171 100%);
}

.disk-space-footer {
    display: flex;
    justify-content: space-between;
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

.disk-space-available {
    color: var(--neon-green);
}

.disk-space-info.low .disk-space-available {
    color: var(--neon-orange);
}

.disk-space-info.critical .disk-space-available {
    color: var(--neon-red);
}

/* Compatibility Mode - Simple Text */
.disk-space-compat {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    text-align: center;
}

.disk-space-compat.disk-space-unavailable {
    color: var(--text-muted);
    font-style: italic;
}

/* Compatibility Mode Global Styles */
.compatibility-mode .disk-space-bar-container,
.compatibility-mode .disk-space-footer {
    display: none;
}

.compatibility-mode .disk-space-info {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
}

/* ============================================
   FILES PANEL
   ============================================ */
.files-panel,
.gallery-panel {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.panel-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.panel-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.refresh-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.refresh-btn:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

.refresh-btn svg {
    width: 18px;
    height: 18px;
}

.refresh-btn.spinning svg {
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ============================================
   FILE LIST
   ============================================ */
.file-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.file-list::-webkit-scrollbar {
    width: 8px;
}

.file-list::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

.file-list::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: var(--radius-full);
}

.file-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    transition: all var(--transition-fast);
}

.file-item:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-sm);
}

.file-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-glass-light);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-lg);
    flex-shrink: 0;
}

.file-info {
    flex: 1;
    min-width: 0;
}

.file-name {
    font-size: var(--font-size-sm);
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 2px;
}

.file-meta {
    display: flex;
    gap: var(--spacing-md);
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

.file-actions {
    display: flex;
    gap: var(--spacing-xs);
    flex-shrink: 0;
}

.file-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    font-size: var(--font-size-sm);
}

.file-btn:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

.file-btn.preview-btn:hover {
    background: var(--neon-cyan);
    border-color: var(--neon-cyan);
}

.file-btn.delete-btn:hover {
    background: var(--neon-red);
    border-color: var(--neon-red);
}

/* ============================================
   LOADING & EMPTY STATES
   ============================================ */
.loading-state,
.empty-state,
.gallery-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    text-align: center;
    color: var(--text-secondary);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: var(--spacing-md);
}

.empty-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state h3,
.gallery-empty h3 {
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.hidden {
    display: none !important;
}

/* ============================================
   GALLERY PANEL
   ============================================ */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    overflow-y: auto;
    flex: 1;
}

.gallery-item {
    position: relative;
    aspect-ratio: 1;
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.gallery-item:hover {
    transform: scale(1.05);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity var(--transition-slow);
}

.gallery-item img.loaded {
    opacity: 1;
}

.gallery-item-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.8) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-fast);
    display: flex;
    align-items: flex-end;
    padding: var(--spacing-sm);
}

.gallery-item:hover .gallery-item-overlay {
    opacity: 1;
}

.gallery-item-name {
    font-size: var(--font-size-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: white;
}

/* ============================================
   AUDIO PLAYER PANEL
   ============================================ */
.audio-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    overflow: hidden;
}

/* Now Playing Section */
.audio-now-playing {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.audio-artwork {
    width: 120px;
    height: 120px;
    background: var(--accent-gradient);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    box-shadow: var(--shadow-glow);
}

.audio-info {
    text-align: center;
}

.audio-title {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--text-primary);
    word-break: break-word;
}

.audio-artist {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

.audio-now-playing audio {
    width: 100%;
    max-width: 400px;
    margin-top: var(--spacing-sm);
    border-radius: var(--radius-md);
}

/* Custom audio player styling */
audio::-webkit-media-controls-panel {
    background: var(--bg-tertiary);
}

/* Track List */
.audio-track-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.audio-track {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.audio-track:hover {
    background: var(--bg-glass-light);
    border-color: var(--accent-primary);
    transform: translateX(4px);
}

.audio-track.playing {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.1);
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.2);
}

.track-number {
    width: 30px;
    height: 30px;
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    flex-shrink: 0;
}

.audio-track.playing .track-number {
    background: var(--accent-gradient);
    color: white;
}

.track-info {
    flex: 1;
    min-width: 0;
}

.track-name {
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.track-meta {
    display: flex;
    gap: var(--spacing-md);
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

.track-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

.track-play-btn,
.track-download-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    font-size: 1rem;
}

.track-play-btn:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    transform: scale(1.1);
}

.track-download-btn:hover {
    background: var(--neon-green);
    border-color: var(--neon-green);
}

/* Audio Empty State */
.audio-empty {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
}

.audio-empty .empty-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
}

.audio-empty h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.audio-empty p {
    color: var(--text-muted);
}

/* ============================================
   MODAL STYLES
   ============================================ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    max-width: 90vw;
    max-height: 90vh;
    animation: scaleIn 0.2s ease;
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    color: var(--text-primary);
    font-size: var(--font-size-xl);
    cursor: pointer;
    transition: all var(--transition-fast);
    z-index: 10;
}

.modal-close:hover {
    background: var(--neon-red);
    border-color: var(--neon-red);
}

/* Preview Modal */
.preview-modal {
    position: relative;
    padding: var(--spacing-md);
    max-width: 95vw;
    max-height: 95vh;
}

.preview-container {
    max-width: 85vw;
    max-height: 65vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    touch-action: none;
    cursor: zoom-in;
}

.preview-container img {
    max-width: 100%;
    max-height: 65vh;
    border-radius: var(--radius-md);
    object-fit: contain;
    transition: transform 0.1s ease-out;
    transform-origin: center center;
    user-select: none;
    -webkit-user-drag: none;
}

.preview-container img[style*="scale"] {
    cursor: grab;
}

.preview-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    margin-top: var(--spacing-sm);
}

.preview-zoom-btn {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-glass);
    color: var(--text-primary);
    font-size: var(--font-size-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-zoom-btn:hover {
    background: var(--bg-glass-light);
    border-color: var(--accent-primary);
}

.preview-zoom-btn:active {
    transform: scale(0.95);
}

.preview-zoom-level {
    min-width: 60px;
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
}

.preview-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.preview-filename {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.preview-download {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--accent-gradient);
    border-radius: var(--radius-sm);
    color: white;
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.preview-download:hover {
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

/* Delete Modal */
.delete-modal {
    padding: var(--spacing-xl);
    text-align: center;
    max-width: 400px;
}

.modal-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
}

.modal-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.modal-message {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-sm);
}

.modal-filename {
    font-size: var(--font-size-sm);
    color: var(--accent-primary);
    font-weight: 500;
    word-break: break-all;
    margin-bottom: var(--spacing-lg);
}

.modal-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

.modal-btn {
    padding: var(--spacing-sm) var(--spacing-xl);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-btn.cancel {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.modal-btn.cancel:hover {
    background: var(--bg-glass-light);
    border-color: var(--text-muted);
}

.modal-btn.danger {
    background: var(--neon-red);
    border: 1px solid var(--neon-red);
    color: white;
}

.modal-btn.danger:hover {
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.4);
}

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */
.toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-width: 400px;
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    animation: slideInRight 0.3s ease;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast.success {
    border-color: var(--neon-green);
}

.toast.error {
    border-color: var(--neon-red);
}

.toast.warning {
    border-color: var(--neon-orange);
}

.toast-icon {
    font-size: var(--font-size-lg);
}

.toast-message {
    flex: 1;
    font-size: var(--font-size-sm);
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    font-size: var(--font-size-lg);
    line-height: 1;
}

.toast-close:hover {
    color: var(--text-primary);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
}

.footer-nav {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
}

.footer-nav .nav-btn {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
}

.footer-nav .nav-btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-primary);
}

.footer-nav .nav-btn.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

.footer-logout {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--danger);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.footer-logout:hover {
    background: rgba(239, 68, 68, 0.2);
    border-color: var(--danger);
}

.footer-text {
    margin: 0;
}

/* ============================================
   RESPONSIVE STYLES - TABLET
   ============================================ */
@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 350px 1fr;
    }
}

/* ============================================
   RESPONSIVE STYLES - MOBILE
   ============================================ */
@media (max-width: 768px) {
    .app-container {
        padding: var(--spacing-sm);
    }
    
    .header {
        padding: var(--spacing-md);
        flex-wrap: wrap;
        gap: var(--spacing-md);
    }
    
    .logo {
        order: 1;
    }
    
    .header-actions {
        order: 2;
    }
    
    .nav {
        width: 100%;
        justify-content: center;
        order: 3;
    }
    
    .user-badge {
        display: none;
    }
    
    .logout-label {
        display: none;
    }
    
    .logout-btn {
        padding: var(--spacing-sm);
    }
    
    .nav-btn {
        flex: 1;
        justify-content: center;
    }
    
    .main-content {
        grid-template-columns: 1fr;
    }
    
    .upload-panel {
        order: 1;
    }
    
    .files-panel,
    .gallery-panel {
        order: 2;
        min-height: 400px;
    }
    
    .upload-zone {
        padding: var(--spacing-xl);
    }
    
    .upload-icon {
        width: 48px;
        height: 48px;
    }
    
    .retention-options {
        flex-direction: column;
    }
    
    .file-item {
        flex-wrap: wrap;
    }
    
    .file-info {
        flex: 1 1 calc(100% - 60px);
        order: 1;
    }
    
    .file-icon {
        order: 0;
    }
    
    .file-actions {
        order: 2;
        width: 100%;
        justify-content: flex-end;
        margin-top: var(--spacing-sm);
        padding-top: var(--spacing-sm);
        border-top: 1px solid var(--border-color);
    }
    
    .file-btn {
        width: 40px;
        height: 40px;
        font-size: var(--font-size-md);
    }
    
    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: var(--spacing-sm);
    }
    
    .preview-modal {
        padding: var(--spacing-sm);
    }
    
    .preview-container {
        max-width: 95vw;
    }
    
    .preview-info {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .delete-modal {
        padding: var(--spacing-lg);
        margin: var(--spacing-sm);
    }
    
    .modal-actions {
        flex-direction: column;
    }
    
    .modal-btn {
        width: 100%;
    }
    
    .toast-container {
        left: var(--spacing-md);
        right: var(--spacing-md);
        bottom: var(--spacing-md);
        max-width: none;
    }
}

/* ============================================
   RESPONSIVE STYLES - SMALL MOBILE
   ============================================ */
@media (max-width: 380px) {
    .logo-text {
        font-size: var(--font-size-md);
    }
    
    .nav-label {
        display: none;
    }
    
    .nav-btn {
        padding: var(--spacing-sm);
    }
    
    .upload-title {
        font-size: var(--font-size-lg);
    }
    
    .file-meta {
        flex-direction: column;
        gap: 2px;
    }
    
    /* Audio panel mobile */
    .audio-now-playing {
        padding: var(--spacing-md);
    }
    
    .audio-artwork {
        width: 80px;
        height: 80px;
        font-size: 2rem;
    }
    
    .audio-track {
        flex-wrap: wrap;
    }
    
    .track-info {
        flex: 1 1 calc(100% - 90px);
    }
    
    .track-actions {
        margin-left: auto;
    }
}

/* ============================================
   TOUCH DEVICE OPTIMIZATIONS
   ============================================ */
@media (hover: none) and (pointer: coarse) {
    .file-btn,
    .nav-btn,
    .modal-btn,
    .retention-btn {
        min-height: 44px;
        min-width: 44px;
    }
    
    .gallery-item-overlay {
        opacity: 1;
    }
}

/* ============================================
   REDUCED MOTION
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
    #particleCanvas,
    .upload-panel,
    .modal-overlay,
    .toast-container,
    .nav,
    .file-actions {
        display: none !important;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .files-panel {
        background: white;
        border: 1px solid #ccc;
    }
}

/* ============================================
   SIMPLE PASTE PANEL
   ============================================ */
.simple-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.action-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 1rem;
}

.action-btn:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

.action-btn.success:hover {
    background: var(--neon-green);
    border-color: var(--neon-green);
}

/* Paste Editor */
.paste-editor {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

.paste-editor-header {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.paste-name-input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: var(--font-size-sm);
}

.paste-name-input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.paste-editor-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.paste-content-input {
    width: 100%;
    min-height: 200px;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', 'Consolas', monospace;
    font-size: var(--font-size-sm);
    line-height: 1.5;
    resize: vertical;
    white-space: pre;
    overflow-wrap: normal;
    overflow-x: auto;
}

.paste-content-input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

/* Paste List */
.paste-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.paste-item {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    overflow: hidden;
    transition: all var(--transition-fast);
}

.paste-item:hover {
    border-color: var(--accent-primary);
}

.paste-item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    cursor: pointer;
}

.paste-item-name {
    font-weight: 500;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.paste-item-meta {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

.paste-item-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.paste-item-content {
    display: none;
    padding: 0 var(--spacing-md) var(--spacing-md);
}

.paste-item.expanded .paste-item-content {
    display: block;
}

.paste-content-preview {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', 'Consolas', monospace;
    font-size: var(--font-size-sm);
    line-height: 1.5;
    white-space: pre-wrap;
    word-break: break-word;
    max-height: 300px;
    overflow-y: auto;
    color: var(--text-secondary);
}

.paste-empty {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
}

/* ============================================
   SETTINGS PANEL
   ============================================ */
.settings-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.settings-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.settings-section {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
}

.settings-section.danger {
    border-color: rgba(239, 68, 68, 0.3);
}

.settings-section-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.settings-section.danger .settings-section-title {
    background: rgba(239, 68, 68, 0.1);
}

.settings-group {
    padding: var(--spacing-md);
}

.settings-info {
    padding: var(--spacing-md);
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-xs) 0;
}

.info-label {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.info-value {
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    font-family: 'SF Mono', 'Monaco', monospace;
}

/* Toggle Switch */
.setting-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    cursor: pointer;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.setting-toggle input {
    display: none;
}

.toggle-slider {
    width: 44px;
    height: 24px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    position: relative;
    transition: all var(--transition-fast);
}

.toggle-slider::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 18px;
    height: 18px;
    background: var(--text-muted);
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.setting-toggle input:checked + .toggle-slider {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.setting-toggle input:checked + .toggle-slider::after {
    left: 22px;
    background: white;
}

/* Input Groups */
.setting-input-group {
    margin-bottom: var(--spacing-md);
}

.setting-input-group:last-child {
    margin-bottom: 0;
}

.setting-input-group label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.setting-input-group input,
.setting-input-group select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: var(--font-size-sm);
}

.setting-input-group input:focus,
.setting-input-group select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.password-input-wrapper {
    display: flex;
    gap: var(--spacing-xs);
}

.password-input-wrapper input {
    flex: 1;
}

.toggle-password-btn {
    width: 40px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.toggle-password-btn:hover {
    background: var(--bg-glass-light);
    color: var(--text-primary);
}

/* Info Box */
.setting-info-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    line-height: 1.6;
}

.setting-info-box code {
    background: var(--bg-primary);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-family: 'SF Mono', 'Monaco', monospace;
    color: var(--neon-cyan);
}

.setting-hint {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    margin-top: var(--spacing-sm);
}

/* Danger Button */
.danger-btn {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-sm);
    color: var(--neon-red);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.danger-btn:hover {
    background: var(--neon-red);
    border-color: var(--neon-red);
    color: white;
}

/* Mobile adjustments for new panels */
@media (max-width: 768px) {
    .paste-content-input {
        min-height: 150px;
    }
    
    .settings-section-title {
        font-size: var(--font-size-xs);
    }
    
    .todos-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ============================================
   TODOS PANEL
   ============================================ */
.todos-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

/* Todos Stats */
.todos-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.stat-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
    transition: all var(--transition-fast);
}

.stat-card:hover {
    border-color: var(--accent-primary);
}

.stat-value {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Sync Warning */
.sync-warning {
    margin: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(249, 115, 22, 0.1);
    border: 1px solid rgba(249, 115, 22, 0.3);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--neon-orange);
}

/* Todo Editor */
.todo-editor {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

.todo-editor-header {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.todo-title-input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: var(--font-size-md);
    font-weight: 500;
}

.todo-title-input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.todo-desc-input {
    width: 100%;
    min-height: 120px;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: var(--font-size-sm);
    line-height: 1.5;
    resize: vertical;
    margin-bottom: var(--spacing-md);
}

.todo-desc-input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.todo-editor-options {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    align-items: center;
}

.todo-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.todo-option label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.todo-option select,
.todo-option input {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: var(--font-size-sm);
}

/* Todo List */
.todo-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.todo-item {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    overflow: hidden;
    transition: all var(--transition-fast);
}

.todo-item:hover {
    border-color: var(--accent-primary);
}

.todo-item.completed {
    opacity: 0.6;
}

.todo-item.completed .todo-item-title {
    text-decoration: line-through;
}

.todo-item-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    cursor: pointer;
}

.todo-checkbox {
    width: 22px;
    height: 22px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.todo-checkbox:hover {
    border-color: var(--accent-primary);
}

.todo-item.completed .todo-checkbox {
    background: var(--neon-green);
    border-color: var(--neon-green);
}

.todo-checkbox::after {
    content: '✓';
    color: white;
    font-size: 14px;
    opacity: 0;
}

.todo-item.completed .todo-checkbox::after {
    opacity: 1;
}

.todo-item-content {
    flex: 1;
    min-width: 0;
}

.todo-item-title {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.todo-item-meta {
    display: flex;
    gap: var(--spacing-md);
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

.todo-priority {
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.todo-priority.high {
    background: rgba(239, 68, 68, 0.2);
    color: var(--neon-red);
}

.todo-priority.medium {
    background: rgba(249, 115, 22, 0.2);
    color: var(--neon-orange);
}

.todo-priority.low {
    background: rgba(34, 197, 94, 0.2);
    color: var(--neon-green);
}

.todo-item-actions {
    display: flex;
    gap: var(--spacing-xs);
    flex-shrink: 0;
}

.todo-item-desc {
    display: none;
    padding: 0 var(--spacing-md) var(--spacing-md);
    padding-left: calc(var(--spacing-md) + 22px + var(--spacing-md));
}

.todo-item.expanded .todo-item-desc {
    display: block;
}

.todo-desc-preview {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    white-space: pre-wrap;
    word-break: break-word;
    color: var(--text-secondary);
}

.todo-empty {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
}